数学公式
数列计算器
计算等差数列、等比数列和斐波那契数列
序列信息aₙ = a₁ + (n-1)d = 1 + (n-1) × 1 查看结果
实时计算结果
序列信息
aₙ = a₁ + (n-1)d = 1 + (n-1) × 1
数列和
55
数列中所有项的和
平均值
5.50
所有项的平均值
末项
10
最后一项的值
数列
前{n}项数列
查看明细 (10)
| 明细项目 | 计算值 |
|---|---|
| Term 1 The 1th term of the sequence | 1 |
| Term 2 The 2th term of the sequence | 2 |
| Term 3 The 3th term of the sequence | 3 |
| Term 4 The 4th term of the sequence | 4 |
| Term 5 The 5th term of the sequence | 5 |
| Term 6 The 6th term of the sequence | 6 |
| Term 7 The 7th term of the sequence | 7 |
| Term 8 The 8th term of the sequence | 8 |
| Term 9 The 9th term of the sequence | 9 |
| Term 10 The 10th term of the sequence | 10 |
支持的输入
| 输入 | 说明 |
|---|---|
| 数列类型 | 选择要计算的数列类型 等差数列 · 等比数列 · 斐波那契数列 · 平方数 · 立方数列 · 三角数列 |
| 首项 (a₁) | 数列的第一项 |
| 公差 (d) | 等差数列的公差 |
| 公比 (r) | 等比数列的公比 |
| 项数 (n) | 要计算的项数 |
| 查找第n项 | 查找特定项的值 |
公式
算术:a_n = a_1 + (n-1)*d 几何:a_n = a_1 * r^(n-1)
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